Heh, this question comes up about once a week it seems.
I love going fishing and I love eating fish. I don't see either specially the eating part as a problem for the most part.
However.. the whole sharkfin thing bothers me fishing wise. I think most of us have probably seen those videos of the fishermen catching sharks and cutting the fins off and then dumping the bodies back into the water. Not sure if the bodies remain dumped or if they have other boats that come along and scoop them up later, but if the bodies remain dumped, I think that's a total waste and should be stopped.
That would be like someone killing a cow only for it's rump, or only for the ribs, or tongue and then dumping the rest of it. Just a total waste when you could get so much more out of it ya know.